Temporary hardness of water is due to the presence of:

magnesium sulphate

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sodium chloride

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calcium sulphate

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calcium hydrogen carbonate

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Solution

The correct option is D calcium hydrogen carbonate
The temporary hardness of water is due to the presence of calcium hydrogen carbonate $C a (H C O_{3})_{2}$ .

Calcium hydrogen carbonate decomposes when heated. This happens when water is boiled, resulting in the formation of insoluble calcium carbonate. The precipitation reaction is as follows:

$C a (H C O_{3})_{2} \to C O_{2} + H_{2} O + C a C O_{3} ↓$

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Temporary hardness of water is due to the presence of

The temporary hardness of water is due to the presence of:

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